12 Of The Most Remarkable Caves On Planet Earth

Virgin cave systems comprise some of the last unexplored regions on our planet. Late last year, for the first time ever, a group of cavers photographed a cave in China that's so vast it even has its own weather system.

But for those who deem caving — or spelunking — a little too adventurous, camera-wielding cavers have captured the beauty of the earth's interior.